Honda 4-Stroke 115-150HP Outboard Marine Engine Parts

(1 products)

This page is for Honda 4-Stroke 115-150HP outboard engines. Use it to find compatible parts and practical service information, including maintenance tips, commonly replaced parts, and troubleshooting guidance. You can also browse the main Honda collection. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the Filter & Sort controls to narrow results by horsepower, year range, and part category.

Browse All Honda Parts

How to Identify Your 115-150HP Model

Locate the nameplate/serial tag on the transom bracket or swivel bracket (often on the starboard side). Take a clear photo for reference.
Read the full model code and suffix: these indicate shaft length (e.g., 20"/25"), control type (remote/tiller), and other options.
Confirm your horsepower and family: Honda BF115/BF135/BF150 belong to a high-power inline-4 EFI 4-stroke platform with many shared service items.
Match rigging details (control type, gauge/rigging harness, prop spline) before ordering gearcase, rigging, or electrical components.

Platform Overview

Honda BF115/BF135/BF150 4‑Stroke Platform

Feature	Description
Configuration	Inline-4 EFI 4-stroke outboards designed for smooth, quiet operation and corrosion protection.
Common Models	BF115, BF135, BF150 in various shaft lengths and control options.
Advantages	Strong mid‑range torque, low noise, and efficient fuel economy with broad availability of routine service parts.
Notes	Many routine items interchange across years and within the 115/135/150 family. Always verify by full model designation, serial number, shaft length, and control type before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines for 4-stroke outboards. Always follow the procedures and schedules in your official Honda service manual for your exact model and serial.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Initial 20 hrs; then every 100 hrs or annually	Use marine-grade oil meeting Honda specs; replace the filter and crush washer as needed.	Oil Filters
Gear oil (lower unit)	Every 100 hrs or annually	Inspect for water intrusion (milky oil). Replace drain/fill plug gaskets; service seals if contamination is found.	Honda Lower Unit Seal Kits
Spark plugs	Inspect 100 hrs; replace ~300 hrs or as needed	Check gap and condition; replace sooner for misfire or hard starting.	Spark Plugs
Fuel filter / water-separating filter	Every 100 hrs or annually	Increase frequency with ethanol use or contaminated fuel supply.	Fuel Filters
Water pump impeller / kit	~200 hrs or every 2 seasons (inspect annually)	Replace sooner if the telltale stream is weak, after sand/silt ingestion, or if overheat warnings occur.	Honda Water Pump Repair Kits
Anodes (internal & external)	Inspect monthly; replace when ~50% depleted	Match anode material to your water type (salt, brackish, fresh) for best protection.	Anodes

Frequently Used Parts Categories

Routine Service – Service & Maintenance Kits
Cooling System – Honda Water Pump Repair Kits
Fuel System – Fuel Filters
Ignition / Electrical – Electrical Items
Gearcase & Sealing – Honda Lower Unit Seal Kits
Propulsion – Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale stream / overheat alarm	Inspect intake screens for debris; verify impeller condition; check thermostat operation.	Water pump kit, thermostat, intake screen, anodes
Poor acceleration / loss of power	Check for prop damage or fouling; replace/inspect fuel filter; confirm spark plug condition and correct prop pitch.	Propeller, fuel filter, spark plugs
Hard starting / rough idle	Verify battery voltage and clean terminals; prime fuel system; check plugs; drain contaminated fuel if needed.	Spark plugs, fuel filter, battery/starter cables
Gearcase noise or metal in gear oil	Drain oil and look for water/milkiness; check prop shaft for fishing line; evaluate seals and bearing play.	Lower unit seal kit, drain plug gaskets, bearings

FAQs

Do parts interchange between different years or models in the 115-150HP range?

Many routine service parts are shared within the BF115/BF135/BF150 inline‑4 platform. Always confirm compatibility with the full model code, serial number, shaft length, and control type.

When should I replace the water pump impeller?

As preventive maintenance, replace the impeller about every 200 hours or every two seasons. Replace sooner if you run in sandy/silty water or see a weak telltale stream or temperature warnings.

How often should I change the lower unit gear oil?

Change gear oil every 100 hours or annually. If the drained oil looks milky, smells burnt, or contains metal, inspect and service seals and internal components promptly.

What information helps confirm the right parts for my engine?

Please provide the full model designation, serial number, shaft length (20"/25"), control type, and any installed accessories. Clear photos of the nameplate and the part being replaced are very helpful.

Ready to find parts for your Honda 4‑stroke 115‑150HP outboard? Browse the main Honda collection and use Filter & Sort to narrow by horsepower, year, and model.

Shop Honda Outboard Parts

If you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.